Fluid pump having waterproof structure

Abstract

Provided is a fluid pump including: first and second housings that are mutually coupled; a support, shaft that is fixed to the second housing; an impeller that is accommodated in the first housing to thus pump fluid; a stator that is fixed to the second housing; a first rotor that is placed inside the second housing, rotatably supported on the support shaft, and is placed facing one side of the stator; and a second rotor that is fixed to the impeller, rotatably supported on the support shaft, and is placed facing the other side of the stator. The fluid pump employs an axial type brushless direct-current (BLDC) motor as a drive motor for driving an impeller, to thus realize a slim structure, and is formed to have the stator of the motor buried in the housing, to thus improve waterproof performance of the motor.

1 . A fluid pump comprising:
 first and second housings that are mutually coupled;   a support shaft that is fixed to the second housing;   an impeller that is accommodated in the first housing to thus pump fluid;   a stator that is fixed to the second housing;   a first rotor that is placed inside the second housing, rotatably supported on the support shaft, and is placed facing one side of the stator; and   a second rotor that is fixed to the impeller, rotatably supported on the support shaft, and is placed facing the other side of the stator.   
     
     
         2 . The fluid pump according to  claim 1 , wherein the support shaft is integrally formed on an upper plate of the second housing by an insert-molding method, in which an upper side of the support shaft is located inside the first housing and a lower side thereof is located inside the second housing. 
     
     
         3 . The fluid pump according to  claim 1 , wherein a driver that applies a driving signal for the stator is accommodated inside the second housing. 
     
     
         4 . The fluid pump according to  claim 1 , wherein a stator is a coreless type. 
     
     
         5 . The fluid pump according to  claim 1 , wherein the stator is integrally fixed on an upper plate of the second housing by an insert-molding method. 
     
     
         6 . The fluid pump according to  claim 1 , wherein the first and second rotors comprise a number of magnets made of divided magnet pieces, or a ring shape magnet that is divisionally magnetized into an N-pole and an S-pole, alternately. 
     
     
         7 . The fluid pump according to  claim 1 , wherein the first and second rotors are disposed so that surfaces facing between the first and second rotors have opposite polarities. 
     
     
         8 . The fluid pump according to  claim 1 , wherein the first rotor comprises:
 a rotor support that is rotatably supported on the support shaft that is placed inside the second housing;   a plurality of magnets that are fixed to the rotor support; and   a back yoke that is disposed on rear surfaces of the magnets.   
     
     
         9 . The fluid pump according to  claim 1 , wherein the second rotor comprises:
 a rotor support that is rotatably supported on the support shaft that is placed inside the first housing and that is fixed to the impeller;   a plurality of magnets that are fixed to the rotor support; and   a back yoke that is disposed on rear surfaces of the magnets.   
     
     
         10 . The fluid pump according to  claim 1 , wherein the first and second rotors are rotatably supported on the support shaft by sleeve bearings, respectively. 
     
     
         11 . A fluid pump comprising:
 an axial type motor comprising a stator that generates a rotating torque, and first and second rotors that are disposed in both sides of the stator;   a first housing in which an inlet and an outlet through which fluid flows in and out, respectively, and that accommodates the second rotor;   a second housing that accommodates the first rotor and on an upper plate of which the stator is integrally recessedly formed;   a support shaft that is disposed to penetrate the upper plate of the second housing, in which the first rotor is rotatably supported on an upper side of the support shaft and the second rotor is rotatably supported on a lower side thereof; and   an impeller that is accommodated in the first housing and is integrally formed with the first rotor to thus pump fluid.